.btnBox{
  display: flex;
  align-items: center;
  justify-content: center;
}
.counter{
  text-align: center;
}
.start{
  height: 40px;
  width: 70px;
  font-size: 20px;
  text-align: center;
  margin: 0 5px;
  background-color: aqua;
  border-radius: 10px;
}
.stop{
  height: 40px;
  width: 70px;
  font-size: 20px;
  text-align: center;
  margin: 0 5px;
  background-color: rgb(255, 0, 0);
  border-radius: 10px;
  color: white;
}
.zero{
  height: 40px;
  width: 70px;
  font-size: 20px;
  text-align: center;
  margin: 0 5px;
  background-color: rgb(255, 255, 0);
  border-radius: 10px;

}